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Old 09-18-2012, 05:58 AM   #1
jchu210
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1999 SC2
Default Codes P401 and P405 - EGR ??

Hi all,

just got out of a P341 code simply by replacing the wires.

Now all left to do is get rid of P401 and P405.

some things i did..... took out egr valve, cleaned it
started car without egr attached in order to blow the carbon out


some things i noticed i did not do....
clean egr passage.... wouldnt know how ...
and replace egr gasket.... i cant tell whether or not i am suppose to replace it.... or even how to replace it if its stuck on a part.... (scrape it?)
and more.... dont know much about this topic


thank you all in advance for reading and helping with suggestions, really appreciate it.


99 sc2 1.9 dohc

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Old 09-18-2012, 10:34 AM   #2
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Default Re: Codes P401 and P405 - EGR ??

P0401 Exhaust Gas Recirculation Flow Insufficient Detected

P0405 Exhaust Gas Recirculation Sensor "A" Circuit Low

Search threads about these two issues and whether or not the egr valve is faulty. No cleaning in the world will fix a broken feedback sensor but a sticking pintle valve can benefit from cleaning. If the engine runs fine then the egr valve electronics and/or motor failed.

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Old 09-18-2012, 05:23 PM   #3
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Default Re: Codes P401 and P405 - EGR ??

wait a sec.... did u say motor fail ????

.... what does that mean !!

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Old 09-18-2012, 05:40 PM   #4
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Default Re: Codes P401 and P405 - EGR ??

Your egr valve is an electric one, using stepper motors to move the pintle valve. The feedback sensor is electronic and senses pintle valve position that's sent back to the pcm to tell the pcm what position the pintle valve is in.

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Old 09-19-2012, 06:43 PM   #5
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Default Re: Codes P401 and P405 - EGR ??

so i cleaned the egr again, blew out the passages again, still code 401.

am i right to go to junkyard to get the replacement egr valve??

fdryer thank you btw

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Old 09-19-2012, 06:53 PM   #6
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Default Re: Codes P401 and P405 - EGR ??

Yes, just remember there's no guarantee that a used one will work.

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